I want to draw a bar chart which contains five individual bars - I have used Achartengine. I am able to display all five bars in the same color but I want to differentiate one bar with a different color, but I cant display more than one color. Please show me how to display different colors. My code...
values.add(new double[] {21,56,33,10,20});
int[] colors = new int[] { Color.rgb(227, 121, 15) };
XYMultipleSeriesRenderer renderer = buildBarRenderer(colors);
setChartSettings(renderer, "", "", "", 0,5, 0,100, Color.WHITE, Color.WHITE);
renderer.setXLabels(8);
renderer.setYLabels(10);
renderer.setDisplayChartValues(true);
mChartView= ChartFactory.getBarChartView(context, buildBarDataset(titles, values), renderer,
Type.DEFAULT);
layout.addView(mChartView, 350, 500);
Can be achieved by extending the SimpleSeriesRenderer and BarChart classes. Here is my solution for RangeBarChart (all thanks to gilenodm, wish I had some reputation to upvote your answer):
import org.achartengine.renderer.SimpleSeriesRenderer;
public class AdvancedSeriesRenderer extends SimpleSeriesRenderer
{
private int [] colors;
public void AdvancedSeriesRenderer ()
{
}
public int getColor ( int position )
{
return colors[position];
}
}
import org.achartengine.chart.RangeBarChart;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
public class AdvancedRangeBarChart extends RangeBarChart
{
private int [] barChartColors;
public AdvancedRangeBarChart ( XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer, Type type )
{
super ( dataset, renderer, type );
}
public void setColors ( int [] colorsIn )
{
barChartColors = colorsIn;
}
@Override
public void drawSeries ( Canvas canvas, Paint paint, float [] points, SimpleSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, int startIndex )
{
int seriesNr = mDataset.getSeriesCount ();
int length = points.length;
paint.setStyle ( Style.FILL );
float halfDiffX = getHalfDiffX ( points, length, seriesNr );
int start = 0;
if ( startIndex > 0 )
{
start = 2;
}
for ( int i = start; i < length; i += 4 )
{
int colorIndex = (int) ( i / 4 ) % barChartColors.length;
paint.setColor ( barChartColors[colorIndex] );
if ( points.length > i + 3 )
{
float xMin = points[i];
float yMin = points[i + 1];
// xMin = xMax
float xMax = points[i + 2];
float yMax = points[i + 3];
drawBar ( canvas, xMin, yMin, xMax, yMax, halfDiffX, seriesNr, seriesIndex, paint );
}
}
}
}
I made a hack to achieve this effect.
Org.achartengine.SimpleSeriesRenderer
changed the class, I added an int[] colors
and a boolean multipleColorsEnabled
with its getters and setters.
So, I changed, org.achartengine.BarChart
in class, the method drawSeries, where is set the color of each bar in a loop, as follows:
int j = startIndex;
for (int i = 0; i < length; i += 2) {
if (seriesRenderer.isMultipleColorsEnabled()) {
paint.setColor(seriesRenderer.getColors()[j++]);
} else {
paint.setColor(seriesRenderer.getColor());
}
float x = points[i];
float y = points[i + 1];
drawBar(canvas, x, yAxisValue, x, y, halfDiffX, seriesNr,
seriesIndex, paint);
}
In the class that loads the data used:
seriesRenderer.setMultipleColorsEnabled(true);
seriesRenderer.setColors(myColors);
It's been a while since I use achartengine, but I think each series has to have its own colour. As a workaround, you could make the bar that you want to differentiate a member of its own series, and set a different colour for that series. Perhaps someone else has a better way though.
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